Observations of random and quasi-periodic scintillations at southern mid-latitudes over a solar cycle

Details Observations of random and quasi-periodic scintillations at southern mid-latitudes over a solar cycle Observations of random and quasi-periodic scintillations at southern mid-latitudes over a solar cycle

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..511h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 50, June 1988, p. 511-517.

Physics

8

Ionospheric Disturbances, Midlatitude Atmosphere, Random Processes, Satellite Transmission, Scintillation, Solar Cycles, Diurnal Variations, Periodic Variations

Scientific paper

Random and Fresnel type quasi-periodic scintillations in southern midlatitudes were recorded from 1973 to 1985, using satellite beacon transmissions at a frequency of 150 MHz, to study the morphology of scintillation-producing irregularities. A distinct increase in random scintillations is observed in the afternoon (1200-1600 LT) in the southern winter only, irrespective of the solar cycle. The most intense scintillation activity is consistently recorded in the southern summer during the premidnight period (2000-2400 LT) irrespective of the solar cycle. Two sharp diurnal peaks in the occurence of quasiperiodic scintillations (the Fresnel type), predominantly in the southern summer in the late morning (0800-1000 LT) and in the premidnight period (2000-2200 LT). A distinct increase in the occurrence number of quasi-periodic scintillations with a decrease in the sunspot number is found.

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